/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package friendManager;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.swing.JOptionPane;
import loginRegister.LoginBean;

/**
 *
 * @author DELL
 */
public class DeleteFriendServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet DeleteFriendServlet</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet DeleteFriendServlet at " + request.getContextPath() + "</h1>");
            out.println("</body>");
            out.println("</html>");
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    
    
    
    
    
    
               public void wrong1() {
        String msg = "名字不能为空！";
        String title = "信息提示";
        int type = JOptionPane.YES_NO_CANCEL_OPTION;
        JOptionPane.showMessageDialog(null, msg, title, type);

    }

               public void wrong2() {
        String msg = "该联系人不存在，无法删除！";
        String title = "信息提示";
        int type = JOptionPane.YES_NO_CANCEL_OPTION;
        JOptionPane.showMessageDialog(null, msg, title, type);

    }
    
        public void right() {
        String msg = "删除成功！";
        String title = "信息提示";
        int type = JOptionPane.YES_NO_CANCEL_OPTION;
        JOptionPane.showMessageDialog(null, msg, title, type);

    }
    
    
    
    
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
         String friendname = new String(request.getParameter("name").getBytes("ISO-8859-1"), "UTF-8");
        if (friendname.length()==0) {
            wrong1();
             response.sendRedirect("http://localhost:8081/PersonInforMSys/friendManager/deleteFriend.jsp");
        }
          else {

            try {
                
                                                Connection con = null;
                java.sql.Statement stmt = null;
                ResultSet rs = null;

                Class.forName("com.mysql.jdbc.Driver");

                String url = "jdbc:mysql://localhost:3306/person?useUnicode=true&characterEncoding=gbk";

                con = DriverManager.getConnection(url, "skyline", "739349");

                stmt = con.createStatement();
                
                 String userName = null;
                
                HttpSession session = request.getSession();
                 ArrayList login = (ArrayList) session.getAttribute("login");
                if (login == null || login.size() == 0) {
                    log("log1:dfhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhj");
                    response.sendRedirect("http://localhost:8081/PersonInforMSys/login.jsp");
                } else {
                    for (int i = login.size() - 1; i >= 0; i--) {

                        LoginBean nn = (LoginBean) login.get(i);
                        userName = nn.getUserName();
                       
                    }
                }
                
                String sql = "select * from friends where name='" + friendname + "'and userName='" + userName + "'";

                rs = stmt.executeQuery(sql);
                rs.last();
                int k = rs.getRow();
                rs.beforeFirst();
                if (k <1) {
                    wrong2();

                      response.sendRedirect("http://localhost:8081/PersonInforMSys/friendManager/updateFriend.jsp");

                } 
                
                else{
                 String sql2= "delete from friends where name='" + friendname + "'and userName='" + userName + "'";
                stmt.executeUpdate(sql2);
                
                 String sql3= "select * from friends where userName='" + userName + "'";
                 log(userName);
                rs = stmt.executeQuery(sql3);
                rs.last();
               
                int list=rs.getRow();
                 rs.beforeFirst();
                    if (list<1) {
                            log("test");
                            ArrayList friendsList=null;
                        session.setAttribute("friendsList", friendsList);
                    }
                    else{
                    ArrayList friendsList2= null;
                    friendsList2 = new ArrayList();


                    while (rs.next()) {

                        LookFriendBean friendBean = new LookFriendBean();
                        friendBean.setName(rs.getString("name"));
                        friendBean.setPhone(rs.getString("phone"));
                        friendBean.setEmail(rs.getString("email"));
                        friendBean.setAddr(rs.getString("addr"));
                        friendBean.setQq(rs.getString("qq"));
                        friendsList2.add(friendBean);
                        log("test");

                    }
                 session.setAttribute("friendsList", friendsList2);
                    }
                    rs.close();;
                    stmt.close();
                    con.close();
                    
             right();
            response.sendRedirect("http://localhost:8081/PersonInforMSys/friendManager/lookFriend.jsp");
           
                }  
                
            } catch (Exception e) {
            }


        }    
        
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    
    
    
    
    

    
    
    
    
    
    
    
    
    
    
    
    
    
    
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        doGet(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
